SaedNews: Engineers in South Korea have developed a device with a new 3D architecture that makes generating electricity from body movement 280 times more efficient.
According to SaedNews’ Science and Technology service, quoting ISNA, researchers at the Daegu Gyeongbuk Institute of Science and Technology (DGIST) in South Korea have created a highly efficient energy-harvesting device that converts body movements into electrical energy. This new device has an energy conversion efficiency 280 times greater than conventional piezoelectric energy harvesters.
The device utilizes the piezoelectric effect, a phenomenon where certain materials produce an electric charge in response to mechanical stress. This means activities such as walking, bending, or even subtle body movements can be used to generate electricity.
Piezoelectric Materials and Their Energy Conversion Potential
Piezoelectric materials inherently exhibit an asymmetry in their charge distribution. When subjected to mechanical stress, such as bending or stretching, this asymmetry is amplified, leading to charge separation and the generation of an electric potential across the material. This process of converting mechanical energy into electrical energy forms the basis of piezoelectric energy harvesting.
While the concept of piezoelectric energy harvesting is not new, its application in wearable devices has been hindered by the limitations of these materials and device designs. Many materials with strong piezoelectric responses, such as Lead Zirconate Titanate (PZT), are inherently rigid and brittle. This makes them unsuitable for integration into flexible and comfortable wearable devices.
The South Korean research team overcame this barrier through innovative material engineering. They developed a unique 3D structure that enables the use of PZT while maintaining a high degree of flexibility and stretchability.
Additionally, the researchers introduced a new electrode design, called the "curvature-specific paired electrode." This design ensures efficient energy harvesting by preventing the cancellation of electric charges generated during movement, significantly enhancing the overall efficiency of the device.
This highly efficient energy harvester paves the way for self-powered wearable electronics. Such devices could potentially eliminate the need for frequent battery recharging or replacement across a wide range of applications, including smartwatches, fitness trackers, and medical sensors.
This research represents a significant step forward in wearable technology. The team's innovative approach to material design and electrode configuration has created a device with the potential to revolutionize how wearable devices are powered.
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